Electric fuse



Feb. 22,1921.

Filed April 27. 1922 W/WQ . Patented Feb. 22, '1927.

UNITED- STATES PATENT OFFICE.

JESSE WENTZ, OF NEW YORK, N. Y., ASSIGNOR T0 WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A. CORPORATION OF NEW YORK.

ELECTRIC FUSE.

Application filed April 27,

This invention relates to electric fuses.

An object of'the inventionis to provide a filling material. for fuses which will offer a maximum resistance to the tendency of the fuses to maintain an are or to explode when the fuse conductor is disrupted.

An efiicient filling material mustbe of a solid nature so that it can be readlly used in commercial fuses; and it-must have ahigh melting. point-. It must not give off a vapor which may become ionized. It must not only be a. non-conductor of electricity when cool, but must maintain its non-conductive properties even 'When raised to a nigh temperature. Furthermore, the filler must be able in the shortest possible time to draw the heat away from the immediate 'vicinity of the break. To accomplislrthis,

' a filler must not only be a good thermal conductor, but must have a high specific heat and a high' density so that it will absorb a maximum quantity of heat. The material 1 must be compact and homogeneous in order to make the full use of its thermalconductivity; and it must he composed of granules of suflicient size so as to present a maximum surface to the gas and thus to absorb as much heat as possible.

Pursuant with its object, this invention 80 provides the use ofa fuse-filling material 1922. Serial No. 556,892.

ally high degree the qualities necessary for a a fuse-filling material, and have been found unusually effective in preventing arcing or explosion. i

The drawing shows a fuse comprising afuse conductor 1 and a casing 2. Granules 40 of fused quartz 3 are shown Within the casing surrounding the fuse conductor.

The invention claimed is:

1. An electric fuse having its fusible element surrounded by coarse granules of pure silica of such size that the diffusion of gas due to the melting of the fusible element is freely permitted.

- 2. An electric fuse having its fusible ele ment surrounded by coarse granules of fused .50 quarts of such size that the diffusion" of gas due to the melting of the fusible element .is freely permitted.

3. An electric fuse having its 'fuse .con-

ductor surrounded by granules of fused 5a 

